LINQ更新用户

public Boolean UpdateUser(int id, string userName, string account, string password, string EkeyID,  int userType,int companyid ,Role ro)
      {
                   var result = (from c in _context.Users.Include("Roles") where c.UserId == id select c).FirstOrDefault();

          //var result = _context.Users.SingleOrDefault<User>(c => c.UserId == id);
          _context.Entry(result).State = System.Data.EntityState.Modified;
        
          result.UserName = userName;

          result.Account = account;
          result.Password = password;

          result.EkeyID = EkeyID;
         // result.CompanyName = PublicKey;
          result.UserType = userType;
          result.CompanyId = companyid;
          result.Roles = new List<Role>();
          result.Roles.Add(ro);
      
       
            //_context.Set<User>().Add(entity);
          _context.SaveChanges();
          return true;
         
      }

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